Toothbrush



FIG. 1 is a perspective view taken from the top, left and upper side of a toothbrush showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view of FIG. 2;

FIG. 4 is a bottom plan view of FIG. 2. 

The ornamental design for a toothbrush, as shown. 